"Hard" means different things to different people, I suppose. To some, it denotes teh difficulty of making it to the top of the sport. Do you think it is easier to become Roger Federer than it is to be a Badminton or Figure skating champion? My definition of hard is the time it takes two beginners to become competent enough have a fun game with each other. In that respect, I found Tennis the hardest sport I played. At first, there were way too many errors and wild shots outside the fences and into adjacent courts. I have never tried skating , but I can see how that would be even harder. It must take a while to even move without falling.